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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of income taxes computed at the United States federal statutory tax rates |  |  |  |  |  |  |  |  |  |  |
Tax at U.S. statutory rate |  |  |  |  |  |  |  |  | $ 39,616 | $ 55,955 | $ 47,522
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |
Tax-exempt interest income |  |  |  |  |  |  |  |  | (1,433) | (3,595) | (3,467)
BOLI income |  |  |  |  |  |  |  |  | (975) | (1,524) | (1,622)
Investment tax credits |  |  |  |  |  |  |  |  | (1,863) | (1,591) | (1,390)
Amortization of investment in low-income housing tax credits |  |  |  |  |  |  |  |  | 1,592 | 1,873 | 1,742
State income tax expense, net of federal benefit |  |  |  |  |  |  |  |  | 4,502 | 1,626 | 1,747
Revaluation of net deferred tax assets as a result of the Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 0 | 14,486 | 0
Other items, net |  |  |  |  |  |  |  |  | 288 | 451 | 315
Total income tax expense | $ 13,098 | $ 8,532 | $ 10,424 | $ 9,673 | $ 30,234 | $ 14,199 | $ 11,993 | $ 11,255 | $ 41,727 | $ 67,681 | $ 44,847

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